Where is the cheapest place to get vacuum hoses on the net?

I am going to replace all my hoses since I am doing an engine overhaul.

 

You probably won't get much help here since this has been discussed many times. Try doing a search for vauum lines/hoses and you'll get all the info you need, including sizes and lengths. That's what I did.
I concluded that Hose Techniques is an all-around good company so I ordered some yesterday; should be here in a few days so I can't tell you how good they are yet.
Also go to Rob Robinette's site for a great how-to on replacing the hoses.